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我需要一些幫助。我正在用C++/CX編寫一個Win 10應用程序。我正在使用兩個USB到RS485設備，它們都具有相同的VID號碼。在過去的日子裏，我可以編寫一些軟件，並使用良好的舊COMx連接到端口等。多個USB到RS485 FTDI設備ID
我現在正在關注這裏的示例Serial Sample，它使用收集設備信息的方法，以便查找連接的設備時，我在可用設備列表中看到以下內容。
\？\ FTDIBUS＃VID_0403 + PID_6001
兩個設備具有相同的VID和PID。這導致我有線連接到正確的USB設備的問題。我認爲我的應用正試圖同時連接兩臺設備？有沒有人對我如何解決這個問題有任何想法？
void MainPage::Get_Serial_Devices() {
cancellationTokenSource_Port1 = new Concurrency::cancellation_token_source();
cancellationTokenSource_Port2 = new Concurrency::cancellation_token_source();
// THIS USES ASYNCRONOUS OPERATION. GET A LIST OF SERIAL DEVICES AND POPULATE THE COMBO BOX
Concurrency::create_task(ListAvailablePortsAsync()).then([this](DeviceInformationCollection^ serialDeviceCollectioin)
{
// serialDeviceCollection CONTAINS ALL SERIAL DEVICES FOUND, COPY INTO _deviceCollection
DeviceInformationCollection^ _deviceCollection = serialDeviceCollectioin;
// CLEAR EXISTING DEVICES FOR OUR OBJECT COLLECTION
_availableDevices->Clear();
// FOR EVERY DEVICE IN _deviceCollection
for (auto &&device : _deviceCollection) {
if (device->Name->Equals("USB-RS485 Cable")) {
// CREATE A NEW DEVICE TYPE AND APPEND TO OUR OBJECT COLLECTION
_availableDevices->Append(ref new Device(device->Id, device));
Total_Ports++;
this->DeviceLists->Items->Append(device->Id);
}
}
});
void MainPage::ConnectButton_Click(Object^ sender, RoutedEventArgs^ e) {
if (Port1_Connected == false) {
// CAST INDEX TO CORRELATING Device IN _availableDevices
Device^ selectedDevice = static_cast<Device^>(_availableDevices->GetAt(Port_1_ID));
// GET THE DEVICE INFO
DeviceInformation^ entry = selectedDevice->DeviceInfo;
Concurrency::create_task(ConnectToSerialDeviceAsync_Port1(entry, cancellationTokenSource_Port1->get_token())).then([this]() {
Get_Echo();
Waiting_For_Ack = true;
});
}
Concurrency::task<void> MainPage::ConnectToSerialDeviceAsync_Port1(DeviceInformation^ device, Concurrency::cancellation_token cancellationToken) {
// CREATE A LINKED TOKEN WHICH IS CANCELLED WHEN THE PROVIDED TOKEN IS CANCELLED
auto childTokenSource = Concurrency::cancellation_token_source::create_linked_source(cancellationToken);
// GET THE TOKEN
auto childToken = childTokenSource.get_token();
// CONNECT TO ARDUINO TASK
return Concurrency::create_task(SerialDevice::FromIdAsync(device->Id), childToken).then([this](SerialDevice^ serial_device) {
try {
_serialPort_Port1 = serial_device;
TimeSpan _timeOut; _timeOut.Duration = 10;
// CONFIGURE SERIAL PORT SETTINGS
_serialPort_Port1->WriteTimeout = _timeOut;
_serialPort_Port1->ReadTimeout = _timeOut;
_serialPort_Port1->BaudRate = 57600;
_serialPort_Port1->Parity = Windows::Devices::SerialCommunication::SerialParity::None;
_serialPort_Port1->StopBits = Windows::Devices::SerialCommunication::SerialStopBitCount::One;
_serialPort_Port1->DataBits = 8;
_serialPort_Port1->Handshake = Windows::Devices::SerialCommunication::SerialHandshake::None;
// CREATE OUR DATA READER OBJECT
_dataReaderObject_Port1 = ref new DataReader(_serialPort_Port1->InputStream);
_dataReaderObject_Port1->InputStreamOptions = InputStreamOptions::None;
// CREATE OUR DATA WRITE OBJECT
_dataWriterObject_Port1 = ref new DataWriter(_serialPort_Port1->OutputStream);
this->ConnectButton->IsEnabled = false;
this->DisconnectButton->IsEnabled = true;
// KICK OF THE SERIAL PORT LISTENING PROCESS
Listen_Port1();
}
catch (Platform::Exception^ ex) {
this->Error_Window->Text = (ex->Message);
CloseDevice(PORT_1);
}
});